keeping the session alive

I want to know is there any way to keep the user session alive although user is idle beyond session timeout interval.
For some reasons i dont want to increase session timeout duration but still i want that user operation becomes succesfull by keeping the session alive in backgroud.

Well the solution is simple. Make an AJAX request to the server at regular intervals like 15mins to a do-nothing servlet to keep the session alive.

And if you want the session to remain alive for a particular page like a page where user enters long information, then you can set the session time out on the session object in a servlet or JSP for that particular situation i.e. use the setMaxInactiveInterval method of the HttpSession class...